Characteristics of system 1

• generates impressions, feelings, and inclinations; when endorsed by system 2 these become beliefs, attitudes, and intentions
• operates automatically and quickly, with little or no effort, and no sense of voluntary control
• can be programmed by system 2 to mobilize attention when a particular pattern is detected (search)
• executes skilled responses and generates skilled intuitions, after adequate training
• creates a coherent pattern of activated ideas in associative memory
• links a sense of cognitive ease to illusions of truth, pleasant feelings, and reduced vigilance
• distinguishes the surprising from the normal
• infers and invents causes and intentions
• neglects ambiguity and suppresses doubt
• is biased to believe and confirm
• exaggerates emotional consistency (halo effect)
• focuses on existing evidence and ignores absent evidence (WYSISATI)
• generates a limited set of basic assessments
• represents sets by norms and prototypes, does not integrate
• matches intensities across scales 
• computes more than intended (mental shortgun)
• sometimes substitutes an easier question for a difficult one (heuristics)
• is more sensitive to changes than to states (prospect theory)
• overwieghts low probabilities
• shows diminishing sensitivity to quantity (psychophysics)
• responds more strongly to losses than to gains (loss aversion)
• frames decision problems narrowly, in isolation from one another